From: Ville Mattila <mulperi@...>
Date: 2002-03-21T00:02:30+09:00
Subject: Q: Xmlparser and DTDs

Hello again,

I asked this before but I didn't get any answers. So i'll ask again
Now with example. The versions are

ruby 1.6.5
xmlparser 0.6.1
expat 1.95.2

The below example should generate error, because there is #REQUIRED in dtd,
and not to happily print

xmltest output: bar is >bar< and baz is >baz

--- xmtest.rb ----
require 'xmlparser'

class Foo < XML::Parser
  attr_reader :bar, :baz

  def startElement(name, attr)
    if name == "foo"
      @bar = attr['bar']
      @baz = attr['baz']
    end
  end

  def endElement(name)

  end

  def externalEntityRef(context, base, systemId, publicId)
    e = Foo.new(self, context)
    e.parse(open(systemId).read)
    e.done
  end
end

f = Foo.new
if f.respond_to?(:setParamEntityParsing)
  f.setParamEntityParsing(XML::Parser::PARAM_ENTITY_PARSING_UNLESS_STANDALONE)
end
begin
  f.parse(File.open("foobar.xml").read)
rescue XML::ParserError
  puts "#{$!} in line #{f.line}\n"
  exit
end

puts "bar is >#{f.bar}< and baz is >#{f.baz}<"
-------------------
--------foobar.xml---------------
<!ELEMENT foobar (foo, barbaz)>

<!ELEMENT foo EMPTY>
<!ATTLIST foo
    bar       CDATA      #REQUIRED
    foo       CDATA      #REQUIRED
    baz       CDATA      "baz"
>



<!ELEMENT barbaz EMPTY>
<!ATTLIST barbaz
    barfoo    CDATA      #REQUIRED
>
---------------
--- foobar.dtd---------
<?xml version="1.0" encoding="ISO-8859-1" standalone="no"?>
<!DOCTYPE foobar SYSTEM "foobar.dtd">
<foobar>
    <foo bar="bar"/>
</foobar>